Question

hydrogen shows similarity with alkali metal as well as
halogen ​

Answer 1

As the hydrogen has 1 electron in valency shell similar to alkali metals it shows similarity with alkali metals as well as hydrogen shows similarity with halogens due to it forms dia atomic molecule similar to halogens and hydrogen is a gas as like as some elements in halogens.

Answer 2

Answer:

(1) Hydrogen shows similarity with alkali metals :

(i) Hydrogen has electronic configuration 1s¹ which is similar to outer electronic configuration of alkali metals, ns¹.

(ii) Both, hydrogen and Alkali metals form univalent positive ions (+1) by loss of 1 electron

(iii) Both combine with halogen to form halides.

$\sf{H_2 + Cl_2}\rightarrow{2HCl}$

$\sf{2Na + Cl_2}\rightarrow{2NaCl}$

(2) Hydrogen show similarity with halogens :

(i) Halogens have outer electronic configuration $\sf{ns^2np^5}$ which resembles that of hydrogen 1s¹.

(ii) Both form univalent negative ion (-1).

(iii) Both react with metals.

$\sf 2Na\ +\ Cl_2\ \longrightarrow\ 2NaCl$